Your Health: Oct. 4, 1999

BRAT PACK Hang in there, parents. That naughty child of yours may turn into an angel--eventually. A study of more than 1,000 inner-city boys concludes that there's a nearly 90% chance that young boys who bully or engage in other aggressive behavior will grow out of it by late adolescence. Moreover, contrary to the worries of many Ritalin-weary moms and dads, boys who are hyperactive but not particularly aggressive aren't likely to become violent later in life.

FROZEN FERTILITY For the first time, doctors appear to have restored the fertility of a prematurely menopausal woman by reimplanting ovarian tissue...